package top.jacktgq.web.filter;

import top.jacktgq.pojo.Userinfo;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class UserLoginPrivilegeFilter implements Filter {

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		//先判断用户是否已经登录：未登录下面的代码不执行
		Userinfo userinfo = (Userinfo) session.getAttribute("userinfo");
		if(userinfo==null){
			System.out.println("用户没有登录");
			//没有登录，跳转到登录页面
			resp.sendRedirect(req.getContextPath()+"/login.html");
			return;
		}
		chain.doFilter(req, resp);
	}

	@Override
	public void destroy() {

	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {

	}

}
